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This is the Security Target (ST) associated with the latest Maintenance Release.
To view previous STs for this TOE, click here.

Product Description

The TOE is a mobile device based on Android 8 with a built-in IPsec VPN client and modifications made to increase the level of security provided to end users and enterprises. The TOE is intended for use as part of an enterprise mobility solution providing mobile staff with enterprise connectivity.

The TOE includes a Common Criteria mode (or “CC mode”) that an administrator can invoke using an MDM.The TOE must meet the following prerequisites in order for an administrator to transition the TOE to CC configuration.

The TOE includes a containerization capability, Knox Workspace Container, which is part of the Knox Platform. This container provides a way to segment applications and data into two separate areas on the device, such as a personal area and a work area, each with its own separate apps, data and security policies. For this effort the TOE was evaluated both without and with a Knox Workspace container created (and to create a Knox Workspace container, one must purchase an additional license).Thus, the evaluation includes several Knox-specific claims that apply to a Knox Workspace container when created.

There are different models of the TOE, the Samsung Galaxy Devices on Android 8, and these models differ in their internal components (as described in Evaluated Configuration section below).

Evaluated Configuration

The model numbers of the mobile devices used during evaluation testing are as follows:

Device Name

Model Number

Chipset Vendor

CPU

Build Arch/ISA

Android Version

Kernel Version

Build Number

Galaxy S9+

SM-G965F

Samsung

Exynos 9810

A64

8.0

4.9.65

R16NW

Galaxy S9+

SM-G965U

Qualcomm

SDM845

A64

8.0

4.9.59

R16NW

Galaxy S8

SM-G950F

Samsung

Exynos 8895

A64

8.0

4.4.13

R16NW

Galaxy S8+

SM-G955U

Qualcomm

MSM8998

A64

8.0

4.4.78

R16NW

Table 1 Evaluated Devices

In addition to the evaluated devices, the following device models are claimed as equivalent with a note about the differences between the evaluated device and the equivalent models.

Evaluated Device

CPU

Equivalent Devices

Differences

Galaxy S9+ (Qualcomm)

SDM845

Galaxy S9 (Qualcomm)

S9+ is larger

Galaxy S9+ (Samsung)

Exynos 9810

Galaxy S9 (Samsung)

S9+ is larger

Galaxy S8+ (Qualcomm)

MSM8998

Galaxy S8 (Qualcomm)

S8+ is larger

Galaxy Note8 (Qualcomm)

Note8 includes S Pen & functionality to take advantage of it for input (not security related)

Galaxy S8 Active

S8+ is larger

S8 Active has a IP68 & MIL-STD-810G certified body

Galaxy S8 (Samsung)

Exynos 8895

Galaxy S8+ (Samsung)

S8+ is larger

Galaxy Note8 (Samsung)

Note8 is larger

Note8 includes S-Pen

Table 2 Equivalent Devices

In general, the devices include a final letter or number at the end of the name that denotes that the device is for a specific carrier or region (for example, U = US Carrier build and F = International, which were used during the evaluation).The following list of letters/numbers denotes the specific models that may be validated:

J – KDDI,

D – NTT Docomo,

U – All US Carriers (unified US model),

N – All Korean Carriers (unified Korean model),

F/C/I – International

For each device there are specific models which are validated. This table lists the specific carrier models that have the validated configuration (covering both evaluated and equivalent devices).

Device Name

Base Model Number

Carrier Models

Galaxy S9 (Qualcomm)

SM-G960

U, SC-02K*, SCV38*

Galaxy S9 (Samsung)

SM-G960

N, F

Galaxy S9+ (Qualcomm)

SM-G965

U

Galaxy S9+ (Samsung)

SM-G965

N, F

Galaxy Note8 (Qualcomm)

SM-N950

U, SC-01K*, SCV37*

Galaxy Note8 (Samsung)

SM-N950

N, F

Galaxy S8 (Qualcomm)

SM-G950

U

Galaxy S8 (Samsung)

SM-G950

N, F

Galaxy S8+ (Qualcomm)

SM-G955

U

Galaxy S8+ (Samsung)

SM-G955

N, F

Galaxy S8 Active

SM-G892

A, U, None

Table 3 Carrier Models

The carrier models marked by * are explicit model numbers for those carriers and do not follow the standard specified for other models. Where Carrier Models specifies “None” that means a device without a suffix is also a device that can be placed into a validated configuration.

Security Evaluation Summary

The evaluation was carried out in accordance to the Common Criteria Evaluation and Validation Scheme (CCEVS) requirements and guidance. The evaluation demonstrated that the TOE meets the security requirements contained in the Security Target.The criteria against which the TOE was judged are described in the Common Criteria for Information Technology Security Evaluation, Version 3.1, Revision 4, September 2012. The evaluation methodology used by the evaluation team to conduct the evaluation is the Common Methodology for Information Technology Security Evaluation, Evaluation Methodology, Version 3.1, Revision 4, July 2012.Gossamer Security Solutions determined that the evaluation assurance level (EAL) for the TOE is EAL 1.The product, when delivered and configured as identified in the Samsung Android 8 on Galaxy Devices Administrator Guide, Version 4.0, May 15, 2018 and the Samsung VPN Client on Galaxy Devices, Version 4.0, March 28, 2018 documents, satisfies all of the security functional requirements stated in the Samsung Galaxy Devices on Android 8 (MDFPP31/WLANCEP10/VPNC21) Security Target, Version 0.4, May 15, 2018.The project underwent CCEVS Validator review.The evaluation was completed in May 2018.Results of the evaluation can be found in the Common Criteria Evaluation and Validation Scheme Validation Report (report number CCEVS-VR-VID10898-2018) prepared by CCEVS.

Environmental Strengths

The logical boundaries of the Samsung Galaxy Devices on Android 8 are realized in the security functions that it implements. Each of these security functions is summarized below.

Security Audit:

The TOE generates logs for a range of security relevant events. The TOE stores the logs locally so they can be accessed by an administrator or they can be exported to an MDM.

Cryptographic support:

The TOE includes multiple cryptographic libraries with CAVP certified algorithms for a wide range of cryptographic functions including: asymmetric key generation and establishment, symmetric key generation, encryption/decryption, cryptographic hashing and keyed-hash message authentication. These functions are supported with suitable random bit generation, key derivation, salt generation, initialization vector generation, secure key storage, and key and protected data destruction. These primitive cryptographic functions are used to implement security protocols such as TLS, EAP-TLS, IPsec, and HTTPS and to encrypt the media (including the generation and protection of data and key encryption keys) used by the TOE.Many of these cryptographic functions are also accessible as services to applications running on the TOE.

User data protection:

The TOE controls access to system services by hosted applications, including protection of the Trust Anchor Database. Additionally, the TOE protects user and other sensitive data using encryption so that even if a device is physically lost, the data remains protected. The functionality provided by a Knox Workspace container enhances the security of user data by providing an additional layer of separation between different categories of apps and data while the device is in use.The TOE ensures that residual information is protected from potential reuse in accessible objects such as network packets.

Identification and authentication:

The TOE supports a number of features related to identification and authentication. From a user perspective, except for making phone calls to an emergency number, a password or Biometric Authentication Factor (BAF) must be correctly entered to unlock the TOE. In addition, even when the TOE is unlocked the password must be re-entered to change the password or re-enroll the biometric template. Passwords are obscured when entered so they cannot be read from the TOE's display, the frequency of entering passwords is limited and when a configured number of failures occurs, the TOE will be wiped to protect its contents. Passwords can be constructed using upper and lower case characters, numbers, and special characters and passwords between 4 and 16 characters are supported.

The TOE can also serve as an 802.1X supplicant and can use X.509v3 and validate certificates for EAP-TLS, TLS and IPsec exchanges.The TOE can also act as a client or server in an authenticated Bluetooth pairing.In addition to storing X.509 certificates used for IPsec connections, the TOE can also securely store pre-shared keys for VPN connections.

Security management:

The TOE provides all the interfaces necessary to manage the security functions (including the VPN client) identified throughout this Security Target as well as other functions commonly found in mobile devices. Many of the available functions are available to users of the TOE while many are restricted to administrators operating through a Mobile Device Management solution once the TOE has been enrolled. Once the TOE has been enrolled and then un-enrolled, it removes all MDM policies and disables CC mode.

Protection of the TSF:

The TOE implements a number of features to protect itself to ensure the reliability and integrity of its security features. It protects particularly sensitive data such as cryptographic keys so that they are not accessible or exportable. It also provides its own timing mechanism to ensure that reliable time information is available (e.g., for log accountability). It enforces read, write, and execute memory page protections, uses address space layout randomization, and stack-based buffer overflow protections to minimize the potential to exploit application flaws. It also protects itself from modification by applications as well as isolates the address spaces of applications from one another to protect those applications.

The TOE includes functions to perform self-tests and software/firmware integrity checking so that it might detect when it is failing or may be corrupt. If any of the self-tests fail, the TOE will not go into an operational mode. It also includes mechanisms (i.e., verification of the digital signature of each new image) so that the TOE itself can be updated while ensuring that the updates will not introduce malicious or other unexpected changes in the TOE. Digital signature checking also extends to verifying applications prior to their installation.

TOE Access:

The TOE can be locked, obscuring its display, by the user or after a configured interval of inactivity. The TOE also has the capability to display an advisory message (banner) when users unlock the TOE for use.

The TOE is also able to attempt to connect to wireless networks as configured.

Trusted path/channels:

The TOE supports the use of 802.11-2012, 802.1X, EAP-TLS, TLS, HTTPS and IPsec to secure communications channels between itself and other trusted network devices.